Assigitob



A. LTHANI.

GRINDING DEVICE.

APPLICATION FILED Aue. II. 1915.

I,3I9,713 Patented oet. 28,I919.

i OF BEVERLY, MSSACHUSETTS, ASSIGNGR, BY IME-SNE MSIGNMENTS,

TO 'UNIITED SHE MCHINERY CORPOTION, 0F PATERSON, NEW JERSEY, A. COR- POTION 0F NEW JERSEY.

@BINDING DEVICE.

Specification of Letters Patent.

Patented @en 2d, 19rd.

napplication led August 11, 1915. Serial No. 44,336.

To all whom t may cof/wem:

Be it known that l, ALBERT LATHAM, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain lmprovements in Grinding Devices, of which the following description, in connection with the accompanying drawings, is a speciication, like reference characters cn the drawings indicating like parts in the several figures.

This invention relates to devices for grinding or sharpening the teeth of rotary cutters such as are used, for example, for trimming the edges of soles in the manufacture of boots and shoes; and an object of the invention. is to provide a device of this character by the use ot which the proper location of the cutter with reference to the grinding member may be accurately determined and the position of the cutter readily controlled so as to insure accurate grinding of the teeth.

ln a more particular aspect, an important object of the invention is tov provide a device lsuitable for use in grinding cutters of the type disclosed in my prior Patent No. 1,104,910, granted July 28, 1914. ln a cutter of this type the plane of the front face of each tooth is!I disposed at a predetermined angle to .the axis of the cutter, and for the best results this angle should vary A1n accordance with differences in diameter 'between the ends of cutters.

An important lfeature of this invention, therefore, consists in novel cutter positioning means arranged to be readily manipulated to adjust the angular relation of a cutter to theplane of the grinding member and to vary this relation for cutters of different sizes and shapes.

Further features ot' the invention are to be recognized in means for insuring'a firm support for a cutter during the grinding operation while permitting the cutter to be readilymanipulated to bring the teeth successively into position to be ground, and in a novel organization of mechanism for presenting the cutter to the grinding member constructedv and arranged to minimize 'the deposit oit emery dust upon the bearing faces of relatively movable portions of the mechation and combinations of parts, will now be described with reference to the accompanying drawings and pointed out in .the claims.

In the drawings,- g Figure l is a perspective view of a. device in' which is embodied a preferred form or'a the invention;

i4" ig. 2 is a View in elevation of a portion p f the device showing parts in vertical sec- Fig. 3 is a vertical section through the cutter positioning means at right angles to the sectional plane of F ig. 2, and

Fig. 4 is a fragmentary plan view.

The illustrated device includes an emery wheel 2 mounted upon a shaft 4 which is supported for-rotation in bearings 6 in an upright standard 8. This standard, in the form shown, is adapted to be secured to a bench`or other irm support, 'but it may obviously be adapted to form a portion of the frame or" an edge trimming machine in which rotary cutters are used. Mounted upon a lug l0 on the standard and extending into proximity to the emery wheel is a bracket 12. rlhis bracket is provided with a longitudinal slot 14, and is secured in position upon the lug 10 bymeans of a bolt 16 vwhich extends through the slot 14 and bracket is thus adjustable about the axis of' the boltl and also iongitudinally within limits determined by the slot 14 tovary the position of its outer end portion and the parts carried thereby relatively to the wheel 2.

At its outer end the bracket 12 is formed to provide a split bearing 20 in which is mounted, with provision for both vertical and angular adjustment, the shank portion 22 ofa supporting member 24, this member being secured in adjusted position through contraction of the bearing 20 by means of a bolt 26 and a thumb nut 28; rlhe member 24 is curved substantially in the arc of a circle about an axis that extends longitudinally of the member and is thus formed with a concave upper tace upon which is positioned the correspondingly curved lower face of a member 30 which is formed to provide a bearing tor a longitudinally slidable cutter support 32. rl`he slide 32 has a plane upper surface adapted to engage an end tace of a cutter, as a, to support the cutter duringv vcutter upon the surface of said member. A

rotary cutter is usually formed with a tapering bore that enlarges the larger end of the cutter, the diameter of the bore at the smaller end being constant in cutters of different axial lengths.. In order, therefore, that cutters of different sizes may be positioned upon the supporting surface of the slide 32, the pin 34 is of uniform diameter substantially equal to the diameter of the bore at the smaller end of a cutter. The pin 34, moreover, is positioned at such a distance from the end of the slide that a substantial support for the end face of the cutter is provided on all sides of the pin, the slide having a slot 36 to permit the grinding wheel to project between the cutter teeth when the slide is moved toward the wheel. In practice the cutter will be positioned, as shown, with its larger end resting upon the surface of the slide and will be' held in position during the grinding operation by the thumb and fingers of the operator. It Awill be apparent that with this arrangement lateral movement of the cutter relatively to the slide will be prevented by the pin 34 which substantially fits the bore at the up er end of the cutter so that after proper adjustment of the parts the front face of each tooth will be presented accurately in parallel relation to the plane of the grinding face of the wheel, and any tendency for the cutter to tip will be obviated by the broad surface engagement between the slide 32 and the larger end face of the cutter. Any vibration or chattering of the cutter during the grinding of a tooth will thus be effectively prevented, and moreover upon retraction of the slide the cutter may be freely turned to bring different teeth into position to be ground.

The construction of the members 24 and 30 with curved contacting faces, as previously described, permits the bearing member 30 and the slide to be adjusted relatively to the support 24 to vary the angular relation between the supporting surface of the slide, or the plane of the cutter, and the plane of the grinding wheel. For securing the parts in adjusted position a clamping screw 38 isV threaded in the member 30 4and extends through a slot 40 in the support 24, the head 42 of the screw being arranged to press a contact piece 44 against the lower surface of the member 24. .The screw is manipulated by a handle 46. A leather washer 48 is positioned between the head of the screw and the contact piece to cushion the screw and maintain frictional engagement between the members 24 and 44 during movement of the member 30, thereby facililfrom the smaller to' shielded from emery dust.

tatingl accurate adjustment of the parts.

vThe cutter support may thus be readily adjusted in accordance with the angular relation between the axis of a cutter and the plane of the front face of the cutter tooth so as to permit the faceof the tooth to be positioned in parallel relation to the grindinface of the wheel 2.

he contacting faces of the members 24 and 30 are preferably curved, as in the illustrated construction, about an axis located upon or above the supporting surface of the slide 32. An' important advantage of this arrangement is that angular adjustment of the slide 32 for different cutters may be effected without. altering materially the location in which a cutter is presented to be ground, thus rendering frequent adjustment of themember 24 and the bracket 12 unnecessary.

In devices of this character it is important that the bearings of movable parts be shielded as far as possible from the emery ldust that is incident to the grinding operation. To this end, the slide 32 is of greater width than its bearing member 30 and has side portions formed vto embrace the side flanges 50 on said member. The slide, moreover, is of greater length than the member 30 so as to project forwardly beyond the member during the grinding operation, and the slide is prevented from being retracted beyond the front end of the member 30 by contact of the end of the screw 38 with the front wall of a slot 52 that is formed in the lower surface of the slide. The bearing surfaces of the member 30 are thus substantially The screw 3S, moreover, in cooperation with the end walls of the slot 52, serves to maintain the slide 32 in position upon its bearing member.

In the light of the preceding description a detailed explanation of the'. operation of the device will be unnecessary. lVith the bracket 12and the member .24 properly adjusted to insure movement of the slide 32 in substantially parallel relation to the plane of the wheel 2 and to position the front end of the slide opposite to the periphery of the wheel, the operator mounts a cutter upon the pin 34 in the position illustrated and by manipulation of the screw 38 and the memberBO adjusts the slide so that the front face of a tooth of the cutter may contact with the lateral grinding surface of the wheel in parallel relation to the plane of the wheel. The member 30 is now clamped in adjusted position by means of v the screw 3S. After a tooth has been ground Vthe slide is retracted and the cutter turned about the pin 34 to bring the next tooth into position, after which the slide is again moved forward to carry the cutter into engagement with the wheel. The control of the position of the cutter and the integrin movements of the slide are ed'ected by the operators hand in engagement with the cutter.

llt will be understood that although the invention is of particular utility for grinding cutters of the type disclosed in my prior patent hereinbefore referred to, it is not limited to such use, and that in the matter of constructional details various embodiments of the invention are comprehended within the spirit and scope of the appended claims.

Having described the invention, what l claim as new and desire to secure by Letters Patent of the United States is r* 1. ln a device for grinding rotary toothed cutters, the combination with a grinding member, of a cutter support movable to carry a cutter `toward or from said member, Y

and a relatively stationary bearing member upon which Asaid support is mounted, said bearing member having a bearing surface extending throughout its length beneath the cutter support and upon which it is adjustable to vary the angular relation between the plane-ot the cutter and the plane of the grinding membert 2. ln a device for grinding rotary toothed cutters, the combination with a grinding member, of a cutter support movable to carry a cutter toward or from said member and arranged to engage an end tace of the cutterto position the cutter in a plane transverse to the plane of said member, and a bearing member upon which said support is mounted, .said bearing member being angularly adjustable about an axis in proximity to the cutter-engaging surface of the support.

3. l'n a device for grinding rotary toothed cutters, the combination with a grinding member, ot a support, a cutter carrying slide movable on said support toward and from said member, said support being adjustable about an axis in proximity to the supporting surface for the cutter.

4t. ln a .device for grinding rotary toothed cutters, the combination with a grinding member, of a cutter carrying slide movable toward and from said member, a bearing member upon which the slide is mounted, said bearing member having a curved lower bearing face, and a support for said bearing member having a correspondingly curved face contacting with said bearing face.

5. ln'a device pr grinding cutters, the combination with a grinding member, of a cutter carrying slide movable toward and from said member, a bearing member upon which the slide is mounted, said bearing member having its lower face curved about an axis parallel to the line of I movement of the slide, a support for said bearing member havingf a portion curved to conform to the curve of sald face to permlt rotary toothed adjustment of the bearing member about said axis, and means for securing said bearing member in adjusted position.

6. ln a device for grinding rotary toothed cutters, the combination with a. grinding member, of a cutter carrying slide movable toward and from said member, a bearing member upon which the slide is mounted, a support for the bearing me1nber,'said bearing member and support having curved contacting faces to permit angular adjustment of the bearing member relatively to the support, said support being provided with a slot, a clamping screw threaded in the bearing member and extending through said slot for securing said member in adjusted position, the slide also having a slot opposite to the end of said screw, and the screw extending into the slot in the slide to limit the movement of the slide upon the bearing member.

7. ln a device for grinding rotary toothed cutters, the combination with a grinding member, oi' a support situated adjacent to the grinding member and having a bearing face extending longitudinally and being transversely curved, a bearing member extending along the support and provided with a face correspondingly curved to engage the bearing face of the support, and with guides extending longitudinally of the bearing member above the support, a carrier slidable upon the guides, and a cutterretaining pin rising from the end of the carrier in proximity to the grinding member.

8. ln a device for grinding rotary toothed cutters, the combination with a grinding member, of a support situated adjacent to the grinding member and having a bearing i'ace extending longitudinally and being transversely curved, a bearing member extending along the support and provided with a face correspondingly' curved to engage the bearing face of the support, and a cuttercarrying slide mounted to move upon the bearing member and being ot" suliicient eirtent to at all times cover the upper surface of the bearing member, v

9. ln a device for grinding rotary toothed cutters, the combination with a grinding member, of a support situated adjacent to the grinding member and having a bearing face extending longitudinally and being transversely curved, a bearing member extending along the support and provided with a face correspondingly curved to engage the bearing face of the support, a cutter-carrying slide mounted upon the bearing ber, and retaining means passing through the support and bearing member and cooperating with the slide.

l0. ln a device for grinding a rotary toothed cutter ot dill'erent diameters at opposite ends and having a tapering bore of menlv v movable toward and minimum diameter at the smaller end of the cutter, the combination with a grinding member, of cutter positioning means comprising a support' for the larger end face of the cutter, and a pin of uniform diameter substantially equal to the diameter of the bore at the smaller end of the cutter, Asaid pin being arranged for engagement in the bore of the cutter to control the lateral position of the cutter upon said support while permitting the larger end of,

the cutter to rest upon the support whatever the axial length of the cutter, said support being extended to underlie the larger end face of the cutter on all sides of said pin and having a slot to permit the grinding member t0 project between the teeth of the cutter.

1'1. In a device for grinding rotary toothed cutters, the combination with a grinding member, of a slide having cutter carrying means at its forward end and from said member for grinding the cutter, a support having bearings fo'r the slide and formed to permit the slide -to project at its forward end beyond the supportwhen moved toward said member for grinding, `and means for limiting the rearward movement of the slide away from the grinding member to prevent it from being retracted beyond the forward end of the support.

12. In a device for grinding rotary toothed cutters, the combination with a grinding mem'ber, of a support having side flanges, a cutter carrying slide mounted on said support and having side portions formed to embrace said flanges, said slide being wider than the support and elongated to project beyond the forward end of the support, and means for limiting the rearward movement of the slide to prevent it from being retracted beyond the forward end of the support.

13. In a device for grinding rotary toothed cutters, the combination with a grinding wheel, of a cutter support arranged to present a cutter in position to be ground by said wheel, said support and grinding wheel being relatively adjustable about an axis substantially at right angles to the axis of a cutter on the support to vary the angular relation between the plane rof 'the cutter and the plane of the grinding wheel, said axis being arranged to coincide substantially with the end face of a cutter mounted upon they support so as to permit adjustment for differently shaped cutters Awithout altering materially the location in which a cutter is presented to be ground.

14. In a device for grinding rot-ary toothed cutters, the combination with a grinding member, of a cutter support coniprising a member movable to carry a cutter toward and from the grinding member for grinding, said member 'being adjustable about an axis parallel to its line of movement to position the face of the tooth to be ground in parallel relation to the plane of the acting face of the grinding member, saidaxis being arranged to coincide substantially with the path of movement of the cutter toward and from the grinding member.

15. A device for grinding rotary toothed cutters comprising, in combination, a frame, a grinding wheel mounted on the frame, a bracket on the frame extending into proximity to the grinding wheel, a support vertically adjustable on said bracket and adjustable also relatively to the bracket about a vertical axis, said support having an upper face curved about an axis at right angles to said vertical axis, a bearing inember on said support having a portion curved to conform to the curve of said face so as to permit angular adjustment of said member relatively to the support. means for securing said member in adjusted position, and a cutter supporting slide mounted on said bearing member and movable to carrya cutter into or out of position to be ground by the grinding member.

In testimony whereof I have signed my name to this specification.

ALBERT LATHAM. 

